Superconducting order parameter π-phase shift in magnetic impurity wires
(English)Manuscript (preprint) (Other academic)
It has previously been found that a magnetic impurity in a conventional s-wave superconductor can give rise to a local π-phase shift of the superconducting order parameter. By studying a finite wire of ferromagnetic impurities, we are able to trace the origin of the π-phase shift to a resonance condition for the Bogoliubov-de Gennes quasiparticle states. When non-resonating states localized at the impurity sites are pulled into the condensate for increasing magnetic strength, the superconducting order parameter is reduced in discrete steps, eventually resulting in a π-phase shift. We also show that for a finite spin-orbit coupling, the π-phase shift is preserved and occurs in a large portion of the topologically non-trivial phase.
Condensed Matter Physics Physical Sciences
IdentifiersURN: urn:nbn:se:uu:diva-305210OAI: oai:DiVA.org:uu-305210DiVA: diva2:1034717